Custom culling with box collider

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Hi,

Working in my low poly game I noticed that I have a lot of draw calls and bad performance in mobile devices, so I decided to print on screen only what the player is watching. My game has random elements and I cannot put them on static mode and neither bake lightmaps, so I introduced a box collider attached in the player ship in order to move it with his point of view . This collider enables/disables the elements renderer when it collides with them, you can see it in this mini-video: